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Re: Unhandled kernel unaligned access on IP32 w/ network I/O && 3.7.1?

To: Ralf Baechle <ralf@linux-mips.org>
Subject: Re: Unhandled kernel unaligned access on IP32 w/ network I/O && 3.7.1?
From: Joshua Kinard <kumba@gentoo.org>
Date: Fri, 28 Dec 2012 18:37:45 -0500
Cc: Linux MIPS List <linux-mips@linux-mips.org>
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On 12/28/2012 4:52 PM, Ralf Baechle wrote:
> On Thu, Dec 27, 2012 at 11:27:37PM -0500, Joshua Kinard wrote:
> 
>> Has anyone run into an unhandled kernel unaligned access under 3.7.1?  I've
>> triggered it twice w/ network I/O on an SGI IP32 machine, however, the stack
>> trace does not appear to be specific to any of IP32's own drivers.  3.6.7
>> was very stable, and the two oopses I've triggered so far both happened
>> under 3.7.1.
>>
>> It looks like the culprit is in sk_stream_alloc_skb or tcp_sendmsg, however,
>> I have little experience in the higher-level networking stack within Linux
>> and wanted to see if anyone else has triggered this on other MIPS systems.
>>
>> Seems to happen when I am logged in via SSH (on IPv6) and generating a burst
>> of console output.
>>
>> Unhandled kernel unaligned access[#3]:
>> Cpu 0
>> $ 0   : 0000000000000000 0000000000000010 0000000000000000 bfffff005671271c
>> $ 4   : 0000000000000000 0000000000000000 0000000000000000 0000000000000000
>> $ 8   : 980000005c24e000 0000000000000000 980000005c24e000 00000000000000cc
>> $12   : ffffffff9001fce1 000000001000001e fffffffffffff000 000000000000001f
>> $16   : 980000005c00fa40 ffffffffde0300b8 ffffff0000000000 0000000000000005
>> $20   : 000000007f875700 00000000000005a8 0000000000000008 0000000000000005
>> $24   : 0000000000000001 00000000000003f0
>> $28   : 980000005c00c000 980000005c00fa10 0000000000000000 ffffffff800059a0
>> Hi    : 0000000007a11c93
>> Lo    : b645a1cac992645e
>> epc   : ffffffff8000b700 do_ade+0x1b0/0x480
>>     Tainted: G      D
>                      ^^^
> 
> This kernel has already oopsed before.  Which means this oops message is
> pretty much worthless.
> 
>   Ralf

I'll try to recapture it over the weekend.  This was the only output left in
the serial console buffer when I reattached, as I had the console
disconnected when it happened.  Thanks!

-- 
Joshua Kinard
Gentoo/MIPS
kumba@gentoo.org
4096R/D25D95E3 2011-03-28

"The past tempts us, the present confuses us, the future frightens us.  And
our lives slip away, moment by moment, lost in that vast, terrible in-between."

--Emperor Turhan, Centauri Republic

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